$data2 is already decoded as utf-8, no need to decode it. Use 
$decode2 = from_json($data2);

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لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re: Malformed UTF-8 character (unexpected continuation byte 0x96, with no preceding start byte) by choroba
in thread Malformed UTF-8 character by Yllar

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